The graph shows the blood glucose concentrations of two people, over an eight-hour period, after eating a meal - Edexcel - GCSE Biology - Question 5 - 2013 - Paper 1

At two hours after eating, the blood glucose concentration for the person with diabetes is around 350 mg per dm³, while for the person without diabetes, it is about 100 mg per dm³. Therefore, the difference is:

$350 ext{ mg per dm}^3 - 100 ext{ mg per dm}^3 = 250 ext{ mg per dm}^3$

A cross (✗) should be placed in box A (0 – 2 hours) as this is the period where the blood glucose concentration increased most significantly.

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Growth hormones, primarily auxins, play a crucial role in plant responses to environmental stimuli. In phototropism, auxins are produced at the tip of the shoot in response to light. They promote cell elongation on the shaded side of the plant, causing it to bend towards the light. This results in more efficient photosynthesis.

In gravitropism, auxins respond to gravity by accumulating on the lower side of the root, leading to cell elongation on that side, which causes the root to bend downwards. This ensures that the plant has greater access to water and essential nutrients from the soil.